All-metal system for concrete molding



H. M. GERSMAN' ALL IETAL sYsml FOR concurs uonnrye Filed Juhe 27. 1924 5 Sheets-Sheet l Oct. 6, 1925. 1,556,097

H. M. GERSMAN ALL METAL SYSTEM FOR concurs gamma Filed June 27, 1924 '3 Sheets-Sheet 2 Oct- ,,1925- 1,556,097

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Patented Oct. 6, 1925.

UNITED STATES PATENT OFFICE.

HARVEY M. GERSMAN, OF CHICAGO, ILLINOIS, ASSIGNOR TO KALMAN STEEL 00., OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE.

ALL-METAL SYSTEM: FOR CONCRETE MOLDING.

Application filed June 27, 1924. Serial No. 722,721.'

To all whom it may concern:

Be it known that I, HARVEY M. GnRsMAN, a citizen of the United States, and resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in an All-Metal System for Concrete Molding, of which the following is a specification.

My invention relates to concrete molding and particularly to a system in which metal framing and forms are exclusively used.

One of the objects of my invention is to provide a system of framing adapted for repeated use without the loss incident to the use of timbers and their destruction following a single use.

A further object is to provide a series of units for forming stringers and sofiits which may be adapted for varied spacings and which may be telescoped and nested for convenient shipping and handling.

A further object is to provide means in connection with framing members of the class described which shall adapt the form pans for ready removal after the concrete is set and which shall in addition enable the form pans to be placed from above, thus avoiding the erection of staging for that purpose such as required when the'pans are placed from beneath. I

The invention will be more readily understood by reference to the accompanying drawings, wherein,

Fig. 1 is an elevation partly in section showing a system constructed in accordance with my invention, the view being taken on the line 1-1 of Fig. 2;

Fig. 2 is a plan view of a series of units arranged for the reception of the form pans;

Fig. 8 is a fragmentary sectional view on the line 33 of Fig. 1;

Fig. 4* is an enlarged detail sectional View taken on the line 1- 1 of Fig. 3, and

Fig. 5 is a plan View of the intermediate construction of the spacer bar.

In the drawings it will be seen that I provide shores 10 which may consist of square timbers or of a pair of timbers in spaced relation, as shown in Fig. 3, with a cap 11 at the top. Surmounting each of the shores is a metal cap plate 12, having vertical side flanges 13, which may extend beyond the sides of the shores.

The shores Will be spaced apart at such distances as to bring about the desired result hereafter described.

Mounted on the shores are stringers 14;, 15, each of channel-shape and having laterally extending flanges 16, 17. The stringer unit 1% is of larger size laterally than the stringer unit 15, to the extent of the two thicknesses of metal composing the units. Thus the stringer unit 15 may be received within the stringer unit 1 1. In practice the forms will be telescoped or mounted in overlapped relation at a point within the cap plates: 12 above the shores. The shores will be so placed that relatively short stringer units may be employed; that is, units sufliciently short so that the weight and bulk thereof will not be too great for one workman to handle. In practice the stringer unit 15 will be placed with its re spcctive ends on two shores; thereafter a stringer unit 141 will be laid over the ends of stringer unit 15. The side flanges 16 of the units 1 1 are slightly narrower than the flanges 17 and both flanges 16, 17, bear against the vertical flanges 13 of the metal cap 12.

It will be noted that because of the telescoping relation of the stringer units any variations in spacing of the shores may be accommodated, it being immaterial how much the stringers overlap. This result is secured because of the fact that the stringers are made in two sizes, the dimensions being uniform from end to end and not tapered as in constructions heretofore proposed.

After placing the stringers the soiiits are laid thereon and these members, as best shown in Fig. 1, are similarly constructed. They consist of units 18, 19, the. units 19 being the larger in their transverse dimension and overlapping the units 18. The units have lateral foot flanges 20, 21, and upturned marginal flanges 22, 23, thus forming a channel 24-, at each side of the soffit units. Because of the capacity for telescoping, the soiflt members accommodate themselves to various spacings of the stringers, the extent of overlapping or telescoping relation being immaterial. This is illustrated in Fig. 2.

As a means for supporting the form pans 25, I utilize a combined spreader and support consisting of two telescoped channels 26, 27, united in end to end relation by means of slots 28, and bolts 29, in order to provide slight capacity for longitudinal adjustment. The flanges of the channels 26, 27, which project upwardly, are provided with diagonal, inwardly extending notches 30, and the lower marginal flanges 31 of the pans 25 are correspondingly inwardly bent to enter the notches. As shown in Fig. 4, the ends of the spreader bars are supported in the following manner. An angle 82 is riveted to the end of the channel and a pair of legs 33, 34, are pivoted thereon by means of the pivot bolt 35. Nail holes 36, 37, in the legs provide for two adjustments of position of the legs; in other words, the height of the spreader member may be controlled by pass ing a nail or pin through either of the two holes. The legs 33, 34, have lateral extensions 38, 39, which have vertical notches near the outer edge, adapted to receive the upturned marginal flanges 22, 23, of the soiiits. By this means the soflits are retained in laterally spaced relation. "When the form pans are to be removed after the setting of the concrete, the pins which retain the legs in rigid relation are removed, the spreader dropped sufficiently to permit its disengagement from the bottom of the pan and thereafter it is removed. The pan may then be dropped, the sides being pressed inwardly sufliciently to pass the lower margins of the soiiits.

One of the outstanding advantages in the use of a construction such as described is that the form pans may be installed from above; in fact, all the form work may be placed without erecting any staging. EX- cept for the shoring, which may or may not be supplied at the job, the framing is of metal, is adapted for unlimited re-use and will be caused to accommodate itself to various spacings and designs of floor work. The units are of relatively short length and light weight and may be handled by one workman. The assembling requires no skill or ability and no mistakes can be made. In rib construction the depth of the rib will be controlled by the height of the pan and limited adjustment which may be secured by the positioning of the spreader. I may prefer to use an adjustable shore, but as this forms no part of the present invention, the details thereof are not disclosed.

I claim:

1. In a concrete molding system, the coinbination of shores, a cap member thereon and metal stringers rested on said cap member, said stringers being of inverted channel construction and comprising alternate wide and narrow units, the narrow unit being adapted to be received within the wide unit.

2. In framing members for concrete construction, the combination of a shore having a flanged cap member and a stringer laid on said cap member and held against lateral movement thereby, said stringer member be ing composed of a plurality of alternate wide and narrow units, the narrow unit being adapted to be received within the wide unit throughout the whole or a part or its length.

3. In training for concrete construction, the combination of shores, and stringers supported thereby, said stringers being of inverted channel shape and provided with marginal flanges, said stringers being composed of a plurality of wide and narrow units, the narrow units being adapted to be received within wide units.

4:. In framing for concrete construction, the combination of shores, andstringers supported thereby, said stringers being of inverted channel shape and provided'withmarginal flanges, said stringers being com-posed or a plurality of wide and narrow units, the narrow nuits being adapted-to be 'received within wide units, each unit being of a length greater than the space between adjacent shores.

5. In framing for concrete construction, the combination of shores, cap pieces having vertical marginal flanges, and stringers laid on said cap pieces, said stringers being composed of successive wide and narrow units, each unit being longer than the space between adjacent shores, the two ends of each narrow unit being adapted to be received within the ends of Wide units. 7

6. In framing for concrete" construction, the combination of supports, stringers laid thereon, said stringers being composed of sectional telescoping channel-shaped units, and soli its supported on said stringers, said soilits being of inverted, channel-shaped tele-v scoping units. I

7 In training for concrete construction, the combination of supports, stringers laid thereon, said stringers being composed of sectional telescoping channel-shaped units, and soflits supported on said stringers, said soflits being of inverted, channel-shaped telescoping units, form pans between the soffits, and means for retaining the form pans in position and permitting their removal without removing the soliits.

8. In framing for concrete construction, the combination of supports, stringers laid thereon and metal soiiits extending transversely of the stringers, said sofhts being composed of inverted, channel-shaped units, alternate units being of wide and narrow construction whereby said narrow units may be received within the wide units.

9. In framing for concrete construction, the combination of supports, stringers laid thereon and metal soflits extending transverse-1y of the stringers, said soffits being composed of inverted, channel-shaped units, alternate units being of wide and narrow construction whereby said narrow units may be received within the wide units, said units having channel-shaped side flanges.

10. An all metal sectional framing system for concrete construction, comprising inverted channel-shaped stringers composed of alternate wide and narrow units, inverted channel-shaped sofiits also composed of alternate wide and narrow channel-shaped units form pans held between the soifits, and means for retaining the soflits against lateral separation and for supporting the pans with capacity for removal independent of the soflits.

11. In framing for concrete construct-ion, the combination of sheet metal, channelshaped stringers and soflits, shores for supporting the stringers, said stringers being composed of alternate wide and narrow units, each unit being only slightly longer than the span between pairs of shores, said soffits being also composed of wide and narrow units, each unit being only slightly longer than the spacing between each pair of stringers, and means spanning the space between adjacent soffits for supporting a form pan and permitting the same to be positioned from above.

Signed at Chicago, 111., this 18th day of June, 1924.

HARVEY M. GERSMAN. 

